Lamp-focusing device



E. C. ALBRIGHT LAMP FOCUSING DEVICE Aug. 14, 1928.

Filed June '11 INVENTOR Epwmw (7 Hz ak/cflr.

ATTOR Patented Aug. 14, 1928.

UNITED STATES,

PATENT OFFICE.

EDWARD C. ALBRIGHT, OF CONNEBSVILLE, INDIANA, ASSIGNOB TO INDIANA LAMPCORPORATION, OF CONNERSVILLE, INDIANA, A CORPORATION.

Lamr-roousme DEVICE.

Application filed June 11, 1927. Serial No. 198,228.

This invention relates to a focusing-d6 yicc for lamp bulbs.

sists in the tiltable support of a lightbulb "receiving socket upon aslidable support and an adjustable mechanism for maintain ing the bulbin the adjusted position, said mechanism having a portion exteriorlyexposed for adjustment.

The full nature of the invention will be understood from theaccompanying drawings and the following description and claims.

In the drawings Fig. 1 is a central sectional view thru a head-lamp,parts thereof being omitted and parts of theinvention being shown inelevation. Fig. 2 is a. top plan view of the lamp-bulb and adjustablesupport. Fig.3 is a central sectional view of parts in elevation of amodified form of tiltable and slidable support for a light bulb. Fig. 4is a view similar to Fig. 3 and of a still further modified form of theinvention.

In the drawings 10 indicates a conventional form of easing having arecess 11, the base 12 of which is centrally apertured to slidablyreceive a tubular bolt 13 having the tool receiving head 14 exteriorlypositioned in the recess and a threaded bolt por tion 15 within thecasing. The interior of the tubular bolt is threaded to receive athreaded focusing member 16 having a toolengageable portion or head 17positioned without the casing and a cam-engaging por tion 18 within thecasing, both extending oppositely beyond the tubular bolt.

The reflector 19 is provided with a central aperture 20 and movablymounted therein is a socket 21 adapted to receive a lamp bulb 22, thesame having a conventional energy supply 23. A U-shaped bracket havingthe mid-portion 24 and the parallel arms 25 pivotally supports as at 26the socket 21. The mid-portion 24 is provided with the threaded opening27 which threadedly receives the threaded bolt 13. Interposed betweenthe casing and the mid-portion 24 of the socket support is a coil spring28 which normally tendsto maintain the head 14 seated in the recess 11and thus maintains the bulb-receiving socket in the projected position.Thus the light bulb can be moved axially by rotating the'tubular bolt.

Thesocket 21 supports at 30 a cam strip 31 which extends between the two:arms 25 and terminates in aslotted end 32 which mounts a tension spring33,th'e same being connected to a similarly'slotted extension 34 of themid-portion 24. The cam portion 31 is engaged bythe end 18 of theadjustable focusing member and such engagement is maintained by thespring 33. Turning the threaded member 16 causes tilting movement of thesocket 21 upon the pivots 26, thus raising or lowering the filament ofthe light bulb into the desired position.

In Fig. 3 like parts are similarly numbered. ,Thus, the casing 10supports the axial adjusting screw 13 and the tilting ad-' justing screw16 having the end 18 for enaging a spring cam portion 131 secured byrivet 130 to the socket 21 positionable in the aperture 20 of reflector19. Rivet 130 also secures a spring 133 which bears upon a portion 134for normally maintaining cam portion 131 in engagement with the end 18of the adjusting screw. The socket 21 is pivotally mounted at 126 in thearms 125 of the U-shaped strap having the intermediate connectionportion 124 apertured at 127 to receive the adjusting screw 13. The

operation of the device is the sameas in Fig. 1.

In Fig. 4 like parts are similarly num bered. Thus, the casing 10supports the.

to receive the adjusting nut 13. A plate 129 is slotted at 128 to formthe depressed tongue or cam 231. The mid-portion 224 and adjacent end ofplate 129 include projecting portions extending towards each other, bothbeing indicated by the numeral 232 and between and upon which is mountedcoil spring 233. The function of the several parts is substantiallythesame as that heretofore described for the embodiments shown in Figs. 1and 3. v

The invention claimed is:

1.- In a focusing l'amp including an apertured reflector, an apertu redcasing in spaced relation therewith, and a lalnpbulb socket mounted inthe reflector aperture for universal movement thereon, and extending to-.ward the casing, the combination of a U- shaped strap having itsmidportion posi tioned between the, socket and the casing and its armsextending towards the socket and hingedly connected ,-therewith, a camforming strap having one end rigid withv the socket and extendingrearwardly be tween the arms of the. U shaped1 strap, 'resilientmeansinterposed between the straps andlnormally constraining the socketand cam toward one position, atubular threaded device'positionable in-the casing aperture and having threaded connection atits inner portionwith the Ushaped strap midportionacterized by the resilient meansincluding a strap portion for anchorage and a resilient portion havingone end operatively associated with the U-shaped strap mid-portiomf; i 4said resilient strap supporting portion and a g i said cam strapconsisting of a'single strapf fi including divergingly directed integralportions. 1 V

In witness whereof, I have hereunto 115- l fixed my signature; 1,, rEDWARD G. ALBRIGHT. i

